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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4b4a4c0abd5c5ba578d6b40683bfb9c7cd1bc36842890ee722c06a3e586306' 
  AND token = '513yotNexcB0g+ocyTmVst85D12baf43L0xYU8x5Rkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}